CN104342119A - Organic electrophosphorescent materials, preparing method thereof and organic electroluminescence devices - Google Patents

Abstract

The invention relates to organic electrophosphorescent materials, a preparing method thereof and organic electroluminescence devices. The structure of the materials (P) is shown as a formula (P) in the specification, wherein R is H or linear-chain or branched C1-C20 alkyl. The materials adopt 2-(2',3',4'-trifluorophenyl)pyrimidine as a cyclometalating ligand, and adopt 2-picolinato as an auxiliary ligand so as to synthesize blue-light organic electrophosphorescent iridium complexes. By chemical modification through introducing the alkyl chain into the pyrimidine ring of the cyclometalating ligand, adjustment of the light color of the materials is achieved, thus obtaining blue light phosphorescence emission having a high luminescent efficiency.

Description

Organic electromechanical phosphorescent material and preparation method thereof and organic electroluminescence device

Technical field

The present invention relates to field of light emitting materials, particularly relate to a kind of organic electromechanical phosphorescent material.The invention still further relates to the preparation method of this organic electromechanical phosphorescent material and its application in organic electroluminescence device.

Background technology

Organic electroluminescent refers to that organic materials is under electric field action, electric energy is converted into a kind of luminescence phenomenon of luminous energy.Make to stay cool to the research of organic electroluminescent due to reasons such as the driving voltage of organic electroluminescence device are too high, luminous efficiency is very low in early days.Until 1987, the human hairs such as the Tang of Kodak understand with oxine aluminium (Alq3) for luminescent material, the high-quality thin film of even compact is made with aromatic diamine, obtain low-work voltage, high brightness, high efficiency organic electroluminescence device, open the new prelude to electroluminescent organic material research.But owing to being subject to the restriction of spin statistics theory, the theoretical internal quantum efficiency limit of fluorescent material is only 25%, how makes full use of all the other phosphorescence of 75% and realize higher luminous efficiency and become hot research direction in after this this field.1997, Forrest etc. found electrophosphorescence phenomenon, and the internal quantum efficiency of electroluminescent organic material breaches the restriction of 25%, makes the research of electroluminescent organic material enter another new period.

In research subsequently, the title complex of small molecules doping type transition metal has become the research emphasis of people, as the title complex of iridium, ruthenium, platinum etc.The advantage of this kind of title complex is that they can obtain very high emitted energy from the triplet state of self, and wherein metal iridium (III) compound, due to good stability, in building-up process, reaction conditions is gentle, and there is very high electroluminescent properties, in research process subsequently, account for dominant position always.And in order to make device obtain full-color display, generally must obtain the ruddiness of excellent performance, green glow and blue light material simultaneously.Compare with green light material with ruddiness, the development of blue light material is more delayed comparatively speaking, the breakthrough point that the efficiency improving blue light material has just become people to study with purity of color.

Summary of the invention

The object of the invention is to solve above-mentioned prior art Problems existing and deficiency, a kind of organic electromechanical phosphorescent material and preparation method thereof and organic electroluminescence device are provided, this organic electromechanical phosphorescent material is with 2-(2', 3', 4'-trifluorophenyl) pyrimidine is cyclic metal complexes, with 2-pyridinecarboxylic for assistant ligand, synthesize a kind of iridium metal complexes of blue light organic phosphorescent electroluminescent materials, and realize the adjustment to material emission color by the chemically modified introducing alkyl chain on the pyrimidine ring of cyclic metal complexes, thus obtain the blue phosphorescent emission of high-luminous-efficiency.

The present invention is directed to above-mentioned technical problem and the technical scheme proposed is: one has the organic electromechanical phosphorescent material of following general formula (P):

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl.

The invention still further relates to a kind of preparation method of above-mentioned organic electromechanical phosphorescent material, the method comprises the following steps:

A) following compd A and B is provided:

Compd A is compd B is

B) under atmosphere of inert gases, described compd A and described compd B are added in organic solvent according to the mol ratio of 1:2 ~ 4, at 62 ~ 135 DEG C, carry out ligand exchange reaction 5 ~ 10 hours, separating-purifying, obtain the organic electromechanical phosphorescent material of following general formula (P):

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl.

Further, in step (b), described organic solvent is the one in cellosolvo, 1,2-ethylene dichloride or 2-methyl cellosolve; The concentration range of described compd A in described organic solvent is 0.01 ~ 0.02mol/L; Described separating-purifying step is as follows: after the reaction solution that described ligand exchange reaction obtains is chilled to room temperature naturally, add proper amount of methanol after removing partial solvent under reduced pressure to refilter, gained solid uses normal hexane, ether in ultrasonic lower washing successively, be that elutriant carries out silica gel column chromatography separation with methylene dichloride, steam and desolventize rear drying.

Further, in above-mentioned steps (a), described compd A adopts following steps to obtain:

C) following Compound C and D is provided:

Compound C is compound D is three hydrated iridium trichloride,

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl;

D) under atmosphere of inert gases, described Compound C and described Compound D are added in the aqueous solution of cellosolvo according to the mol ratio of 2 ~ 4:1, the concentration range of wherein said Compound C in described cellosolvo is 0.1 ~ 0.2mol/L, be heated to stirring reaction 24h under reflux state, after being chilled to room temperature, rotation is steamed except partial solvent, after adding distilled water filtration, then obtains described compd A with after distilled water, methanol wash drying successively.

Described Compound C adopts following steps to obtain:

Further, in above-mentioned steps (c), described Compound C adopts following steps to obtain:

E () provides following compd E and F:

Compd E is compound F 17-hydroxy-corticosterone is 2,3,4-trifluoro-benzene boric acid,

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl;

F) under atmosphere of inert gases, described compd E and described compound F 17-hydroxy-corticosterone are added toluene containing palladium catalyst or N according to the mol ratio of 1:1 ~ 1.5, in dinethylformamide, then drip alkaline catalysts to reheat, Suzuki linked reaction 6 ~ 12h at 85 ~ 100 DEG C of temperature, after being chilled to room temperature, separating-purifying, obtains described compd E.

Further, in above-mentioned steps (f), described palladium catalyst is that four (triphenyl phosphorus) close palladium or two chlorine two (triphenyl phosphorus) closes palladium; Described alkaline catalysts is salt of wormwood or sodium carbonate; Described separating-purifying step is as follows: the reaction solution that described Suzuki linked reaction obtains is poured in methylene dichloride carry out extracting, separatory, and be washed to neutrality, filter with after anhydrous magnesium sulfate drying again, filtrate decompression steams solvent and obtains crude product, be separated for elutriant carries out silica gel column chromatography with normal hexane with ethyl acetate again, after drying, obtain described Compound C.

Further, in above-mentioned steps (f), the mol ratio of described palladium catalyst and described compd E is 0.02 ~ 0.05:1; The mol ratio of described alkaline catalysts and described compd E is 1 ~ 3:1; In described toluene or DMF solution, the volume ratio of solute and water is 2:1; The concentration of described compd E in described organic solvent is 0.1 ~ 0.2mol/L.

The invention still further relates to a kind of organic electroluminescence device, it comprises anode, functional layer, luminescent layer and negative electrode, and the material of described luminescent layer is above-mentioned organic electromechanical phosphorescent material.

Compared with prior art, there is following advantage in organic electromechanical phosphorescent material of the present invention and preparation method thereof and organic electroluminescence device:

Organic electromechanical phosphorescent material of the present invention is cyclic metal complexes agent structure with 2-(2', 3', 4'-trifluorophenyl) pyrimidine, with 2-pyridinecarboxylic for assistant ligand.On the pyrimidine ring of the planar rigidity on main part and phenyl ring, the C-F key of low vibrational frequency is conducive to reducing nonradiative transition probability, improves the luminous efficiency of material; After pyrimidine ring introduces alkyl, the electro mass-energy of giving of alkyl regulates blue light emitting wavelength on the one hand, on the one hand the alkyl chain of different lengths is conducive to increasing its solvability in organic solvent in addition, and produce certain space steric effect, thus the direct effect between minimizing atoms metal, reduce the self-quenching phenomenon of triplet exciton; Fluorine-based and the introducing that is high field intensity assistant ligand 2-pyridinecarboxylic of strong electron-withdrawing group group on phenyl ring can improve luminescent properties, is beneficial to evaporation, increases film-forming type and improves the stability of device.

Accompanying drawing explanation

Fig. 1 is the utilizing emitted light spectrogram of the organic electromechanical phosphorescent material of preparation in the embodiment of the present invention 1.

Fig. 2 is the structural representation of the organic electroluminescence device of preparation in the embodiment of the present invention 5.

Embodiment

Below in conjunction with embodiment, elaboration is further given to the present invention.

Organic electromechanical phosphorescent material of the present invention has following general formula (P):

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl, the position of substitution of alkyl can in 4-or the 5-position of pyrimidine.

The invention still further relates to a kind of preparation method of above-mentioned organic electromechanical phosphorescent material, the method comprises the following steps successively:

1, make compd E and compound F 17-hydroxy-corticosterone by Suzuki linked reaction synthetic compound C; Wherein, compound F 17-hydroxy-corticosterone is 2,3,4-trifluoro-benzene boric acid, and the structural formula of compd E and Compound C is as follows:

Compd E is compound C is

2, Compound C step 1 obtained and Compound D are reacted and are generated chlorine bridge dipolymer, i.e. compd A.Wherein, Compound D is three hydrated iridium trichloride IrCl ₃3H ₂o.The structural formula of compd A is as follows:

3, compd A obtained for step 2 is used as cyclic metal complexes agent structure, by 2-pyridine carboxylic acid (compd B) as assistant ligand source, makes compd A and compd B react to obtain iridium metal complex, i.e. organic electromechanical phosphorescent material (P):

Above in each step, described R is H or C ₁~ C ₂₀straight or branched alkyl; Rare gas element is one or more in nitrogen, helium or neon.

Synthetic route is:

Namely 2-, 3-, 4-position respectively with the fluorine-based phenyl ring of electrophilic and pyrimidine or its derivative replaced with alkyl by Suzuki linked reaction synthesizing ring metal part, then with IrCl ₃3H ₂o reaction generates chlorine bridge dipolymer, and last and assistant ligand source 2-pyridine carboxylic acid reacts obtained target iridium metal complex.

Be specifically described with embodiment below:

Embodiment 1

Organic electromechanical phosphorescent material disclosed in the present embodiment is title complex two (2-(4', 5', 6'-trifluorophenyl) pyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium, its structural formula is as follows:

It obtains as follows:

(1) synthesis of 2-(2', 3', 4'-trifluorophenyl) pyrimidine

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by 1.59g (10mmol) 2-bromo pyrimi piperidine, 2.11g (12mmol) 2, 3, 4-trifluoro-benzene boric acid and 0.58g (0.5mmol) four (triphenyl phosphorus) close palladium and are dissolved in 40ml toluene, the aqueous solution of 20ml containing 2.76g (20mmol) salt of wormwood is dripped subsequently in reaction system, heating, stirring reaction 6h under 100 DEG C of state of temperatures, after question response liquid cooling to room temperature, with dichloromethane extraction, separatory, be washed to neutrality, use anhydrous magnesium sulfate drying again, then filter, filtrate decompression steams solvent for use and obtains crude product, be that the ethyl acetate of 1:4 is separated for elutriant carries out silica gel column chromatography with normal hexane again with volume ratio, 2-(2' is obtained after drying, 3', 4'-trifluorophenyl) pyrimidine 1.03g, yield is 49.0%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 210.0 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₁₀h ₅f ₃n ₂, theoretical value: C, 57.15; H, 2.40; F, 27.12; N, 13.33; Measured value: C, 57.19; H, 2.33; F, 27.17; N, 13.31.The product that the above-mentioned reaction of above data acknowledgement obtains is 2-(2', 3', 4'-trifluorophenyl) pyrimidine.

(2) part be 2-(2', 3', 4'-trifluorophenyl) pyrimidine containing the dimeric synthesis of iridium dichloro

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by 0.36g (1mmol) three hydrated iridium trichloride, 0.52g (2.5mmol) 2-(2', 3', 4'-trifluorophenyl) to be dissolved in 20ml volume ratio be in the cellosolvo/water mixed liquid of 3:1 to pyrimidine, is heated to stirring reaction 24h under reflux state, after being chilled to room temperature, rotate and steam except partial solvent, add distilled water, filter.The solid obtained uses distilled water, methanol wash successively, and obtain solids 0.36g after drying, yield is 55.7%.Product, without the need to further purification, can directly drop in next step reaction.

(3) title complex two (2-(4', 5', 6'-trifluorophenyl) pyrimidine-N, C ²') (2-pyridinecarboxylic) close the synthesis of iridium

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, 0.65g (0.5mmol) part is 2-(2', 3', 4'-trifluorophenyl) pyrimidine be dissolved in 20ml2-ethoxy ethanol containing iridium dichloro dimer and 0.12g (1mmol) 2-pyridine carboxylic acid, be heated to 135 DEG C of reflux states, stirring reaction 5h.Naturally, after being chilled to room temperature, after removing partial solvent under reduced pressure, proper amount of methanol is added.Filter, the ultrasonic lower washing of a small amount of normal hexane, ether used successively by solid.Be that elutriant carries out silica gel column chromatography separation with methylene dichloride, steaming desolventizes, and obtain final title complex 0.24g after drying, yield is 32.7%.

Schema is as follows:

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 733.0 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₂₆h ₁₂f ₆irN ₅o ₂, theoretical value: C, 42.63; H, 1.65; F, 15.56; Ir, 26.24; N, 9.56; O, 4.37; Measured value: C, 42.67; H, 1.60; F, 15.57; Ir, 26.21; N, 9.59; O, 4.36.The material that the above-mentioned reaction of above data acknowledgement obtains is title complex two (2-(4', 5', 6'-trifluorophenyl) pyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium.

Fig. 1 is the utilizing emitted light spectrogram of the organic electromechanical phosphorescent material of the present embodiment, and wherein transverse axis is wavelength (Wavelength, unit nm), and the longitudinal axis is standardized photoluminescence intensity (Normalized PL intensity), and end product is CH at 298K temperature ₂cl ₂solution (~ 10 ^-6the maximum emission peak of the emmission spectrum M) is positioned at 484nm place, and also have an acromion at 510nm place, it can be used as the preparation field that blue light electroluminescent material is widely used in organic electroluminescence device simultaneously.

In addition, 10 ^-6the CH of M end product ₂cl ₂solution at 298K temperature, with concentration for ~ 10 ^-6the CH of the FIrpic of M ₂cl ₂solution is standard (Φ _pL=0.26) Φ of end product, is recorded _pL=0.50, the iridium electroluminescent organic material that contains of visible the present embodiment has higher luminous quantum efficiency.

Embodiment 2

Organic electromechanical phosphorescent material disclosed in the present embodiment is that title complex two (2-(4', 5', 6'-trifluorophenyl)-5-methylpyrimidine-N, C2') (2-pyridinecarboxylic) closes iridium, and its structural formula is as follows:

It obtains as follows:

(1) synthesis of 2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by bromo-for 1.73g (10mmol) 2-5-methylpyrimidine, 1.76g (10mmol) 2,3,4-trifluoro-benzene boric acid and 0.28g (0.4mmol) dichloro two (triphenyl phosphorus) close palladium and are dissolved in 50mlDMF, drip the aqueous solution of 25ml containing 3.18g (30mmol) sodium carbonate subsequently in reaction system.Be heated to stirring reaction 8h at 90 DEG C of temperature, after question response liquid cooling to room temperature, dichloromethane extraction, separatory, be washed to neutrality, and with anhydrous magnesium sulfate drying, then filter, filtrate decompression steams solvent and obtains crude product.With volume ratio be 1/6 ethyl acetate be separated for elutriant carries out silica gel column chromatography with normal hexane, after drying 2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine 1.01g, yield is 45.0%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 224.1 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₁₂h ₈fN ₃, theoretical value: C, 58.93; H, 3.15; F, 25.42; N, 12.50; Measured value: C, 58.96; H, 3.11; F, 25.45; N, 12.48.The material that the above-mentioned reaction of above data acknowledgement obtains is 2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine.

(2) part be 2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine containing the dimeric synthesis of iridium dichloro

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by 0.36g (1mmol) three hydrated iridium trichloride, 0.45g (2mmol) 2-(2', 3', 4'-trifluorophenyl) to be dissolved in 20ml volume ratio be in the cellosolvo/water mixed liquid of 3:1 to-5-methylpyrimidine, is heated to stirring reaction 24h under reflux state.After being chilled to room temperature, rotating and steam except partial solvent, add appropriate distilled water, filter.Solid uses distilled water, methanol wash successively, and what obtain 2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine after drying contains iridium dichloro dimer 0.34g, and yield is 50.4%.2-(2', 3', 4'-trifluorophenyl)-5-methylpyrimidine containing iridium dichloro dimer without the need to further purification, can directly drop into next step reaction in.

(4) title complex two (2-(4', 5', 6'-trifluorophenyl)-5-methylpyrimidine-N, C ²') (2-pyridinecarboxylic) close the synthesis of iridium

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, be 2-(2' by 0.67g (0.5mmol) part, 3', 4'-trifluorophenyl)-5-methylpyrimidine be dissolved in 25ml2-methyl cellosolve containing iridium dichloro dimer and 0.18g (1.5mmol) 2-pyridine carboxylic acid, be heated to 125 DEG C of reflux states, stirring reaction 6h.Naturally, after being chilled to room temperature, after removing partial solvent under reduced pressure, proper amount of methanol is added.Filter, the ultrasonic lower washing of a small amount of normal hexane, ether used successively by solid.Be that elutriant carries out silica gel column chromatography separation with methylene dichloride, steaming desolventizes, and obtains finally two (2-(4', 5', 6'-trifluorophenyl)-5-methylpyrimidine-N, C after drying ²') (2-pyridinecarboxylic) close iridium 0.19g, yield is 25.0%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 761.1 (M+).Ultimate analysis is carried out to described solid: molecular formula is C ₂₈h ₁₆f ₆irN ₅o ₂, theoretical value: C, 44.21; H, 2.12; F, 14.99; Ir, 25.27; N, 9.21; O, 4.21; Measured value: C, 44.27; H, 2.03; F, 14.96; Ir, 25.33; N, 9.13; O, 4.28.The material that the above-mentioned reaction of above data acknowledgement obtains is title complex two (2-(4', 5', 6'-trifluorophenyl)-5-methylpyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium.

End product is CH at 298K temperature ₂cl ₂solution (~ 10 ^-6the maximum emission peak of the emmission spectrum M), at 481nm place, has an acromion at 507nm place, with the CH of the FIrpic of same concentrations simultaneously ₂cl ₂solution is standard (Φ _pL=0.26) Φ of end product, is recorded _pL=0.26, the iridium electroluminescent organic material that contains of visible the present embodiment has higher luminous quantum efficiency, can be used as the preparation field that blue light electroluminescent material is widely used in organic electroluminescence device.

Embodiment 3

Organic electromechanical phosphorescent material disclosed in the present embodiment is title complex two (2-(4', 5', 6'-trifluorophenyl)-5-t-butyl pyrimidines-N, C ²') (2-pyridinecarboxylic) close iridium, its structural formula is as follows:

It obtains as follows:

(1) synthesis of 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by bromo-for 2.15g (10mmol) 2-5-t-butyl pyrimidines, 2.46g (14mmol) 2,3,4-trifluoro-benzene boric acid and the two chlorine two (triphenyl phosphorus) of 0.21g (0.3mmol) are closed palladium and are dissolved in 35mlDMF, drip the aqueous solution of 15ml containing 1.06g (10mmol) sodium carbonate subsequently in reaction system.Be heated to stirring reaction 10h under 85 DEG C of states.After question response liquid cooling to room temperature, dichloromethane extraction, separatory, be washed to neutrality, anhydrous magnesium sulfate drying.Filter, filtrate decompression steams solvent and obtains crude product.With volume ratio be 1/6 ethyl acetate be separated for elutriant carries out silica gel column chromatography with normal hexane, after drying 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines 1.04g, yield is 39.0%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 266.1 (M ⁺).Ultimate analysis: molecular formula is C ₁₄h ₁₃f ₃n ₂, theoretical value: C, 63.15; H, 4.92; F, 21.41; N, 10.52; Measured value: C, 63.11; H, 4.97; F, 21.38; N, 10.54.The material that the above-mentioned reaction of above data acknowledgement obtains is 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines.

(2) part be 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines containing the dimeric synthesis of iridium dichloro

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by 0.36g (1mmol) three hydrated iridium trichloride and 0.80g (3mmol) 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines is dissolved in 20ml2-ethoxy ethanol/water (3/1) mixed solution, stirring reaction 24h at reflux.After being chilled to room temperature, rotating and steam except partial solvent, add appropriate distilled water, filter.Solid uses distilled water, methanol wash successively, and what obtain 2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines after drying contains iridium dichloro dimer 0.29g, and yield is 38.2%.2-(2', 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines containing iridium dichloro dimer without the need to further purification, can directly drop into next step reaction in.

(3) title complex two (2-(4', 5', 6'-trifluorophenyl)-5-t-butyl pyrimidines-N, C ²') (2-pyridinecarboxylic) close the synthesis of iridium

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, be 2-(2' by 0.76g (0.5mmol) part, 3', 4'-trifluorophenyl)-5-t-butyl pyrimidines be dissolved in 30ml trichloromethane containing iridium dichloro dimer and 0.15g (1.25mmol) 2-pyridine carboxylic acid, be heated to 62 DEG C of reflux states, stirring reaction 10h.Naturally, after being chilled to room temperature, after removing partial solvent under reduced pressure, proper amount of methanol is added.Filter, the ultrasonic lower washing of a small amount of normal hexane, ether used successively by solid.Be that elutriant carries out silica gel column chromatography separation with methylene dichloride, steaming desolventizes, and obtains two (2-(4', 5', 6'-trifluorophenyl)-5-t-butyl pyrimidines-N, C after drying ²') (2-pyridinecarboxylic) close iridium 0.15g, yield is 17.8%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 845.2 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₃₄h ₂₈f ₆irN ₅o ₂, theoretical value: C, 48.34; H, 3.34; F, 13.49; Ir, 22.75; N, 8.29; O, 3.79; Measured value: C, 48.37; H, 3.30; F, 13.54; Ir, 22.68; N, 8.34; O, 3.77.The material that the above-mentioned reaction of above data acknowledgement obtains is title complex two (2-(4', 5', 6'-trifluorophenyl)-5-t-butyl pyrimidines-N, C ²') (2-pyridinecarboxylic) close iridium.

End product is CH at 298K temperature ₂cl ₂solution (~ 10 ^-6the maximum emission peak of the emmission spectrum M), at 483nm place, has an acromion at 512nm place, with the CH of the FIrpic of same concentrations simultaneously ₂cl ₂solution is standard (Φ _pL=0.26) Φ of end product, is recorded _pL=0.25.

Embodiment 4

Organic electromechanical phosphorescent material disclosed in the present embodiment is title complex two (2-(4', 5', 6'-trifluorophenyl)-4-eicosyl pyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium, its structural formula is as follows:

It obtains as follows:

(1) synthesis of 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, by 2.20g (5mmol) 2-bromo-4-eicosyl pyrimidine, 1.19g (7.5mmol) 2,3,4-trifluoro-benzene boric acid and 0.12g (0.1mmol) four (triphenyl phosphorus) close palladium and are dissolved in 35ml toluene, drip the aqueous solution of 15ml containing 1.73g (12.5mmol) salt of wormwood subsequently in reaction system.Be heated to stirring reaction 12h under 85 DEG C of state of temperatures.After question response liquid cooling to room temperature, dichloromethane extraction, separatory, be washed to neutrality, anhydrous magnesium sulfate drying.Filter, filtrate decompression steams solvent and obtains crude product.With volume ratio be 1/5 ethyl acetate be separated for elutriant carries out silica gel column chromatography with normal hexane, after drying 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine 0.62g, yield is 25.3%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 490.3 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₃₀h ₄₅f ₃n ₂, theoretical value: C, 73.43; H, 9.24; F, 11.62; N, 5.71; Measured value: C, 73.47; H, 9.18; F, 11.65; N, 5.70.The material that the above-mentioned reaction of above data acknowledgement obtains is 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine.

(2) part be 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine containing the dimeric synthesis of iridium dichloro

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, 0.18g (0.5mmol) three hydrated iridium trichloride, 0.98g (2mmol) 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine is dissolved in 10ml2-ethoxy ethanol/water (3/1) mixed solution, stirring reaction 24h at reflux.After being chilled to room temperature, rotating and steam except partial solvent, add appropriate distilled water, filter.Solid uses distilled water, methanol wash successively, and obtain solids 0.12g after drying, yield is 19.9%.2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine containing iridium dichloro dimer without the need to further purification, can directly drop into next step reaction in.

(3) title complex two (2-(4', 5', 6'-trifluorophenyl)-4-eicosyl pyrimidine-N, C ²') (2-pyridinecarboxylic) close the synthesis of iridium

The reaction formula of synthesis is as follows:

Concrete steps are: under nitrogen atmosphere, 0.48g (0.2mmol) part is 2-(2', 3', 4'-trifluorophenyl)-4-eicosyl pyrimidine be dissolved in 20ml1 containing iridium dichloro dimer and 0.10g (0.8mmol) 2-pyridine carboxylic acid, in 2-ethylene dichloride, be heated to 85 DEG C of reflux states, stirring reaction 8h.Naturally, after being chilled to room temperature, after removing partial solvent under reduced pressure, proper amount of methanol is added.Filter, the ultrasonic lower washing of a small amount of normal hexane, ether used successively by solid.Be that elutriant carries out silica gel column chromatography separation with methylene dichloride, steaming desolventizes, and obtain final title complex 0.05g after drying, yield is 9.7%.

Structural Identification is carried out to described solid: mass spectrum (MS m/z): 1293.7 (M ⁺).Ultimate analysis is carried out to described solid: molecular formula is C ₆₆h ₉₂f ₆irN ₅o ₂, theoretical value: C, 61.28; H, 7.17; F, 8.81; Ir, 14.86; N, 5.41; O, 2.47; Measured value: C, 61.23; H, 7.24; F, 8.76; Ir, 14.93; N, 5.35; O, 2.49.

The material that the above-mentioned reaction of above data acknowledgement obtains is title complex two (2-(4', 5', 6'-trifluorophenyl)-4-eicosyl pyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium.

End product is CH at 298K temperature ₂cl ₂solution (~ 10 ^-6the maximum emission peak of the emmission spectrum M), at 491nm place, has an acromion at 520nm place, with the CH of the FIrpic of same concentrations simultaneously ₂cl ₂solution is standard (Φ _pL=0.26) Φ of end product, is recorded _pL=0.13.

Embodiment 5

With the title complex that embodiment 1 is obtained two (2-(4', 5', 6'-trifluorophenyl) pyrimidine-N, C ²') (2-pyridinecarboxylic) close iridium as luminescent layer doping object organic electroluminescence device, its structure as shown in Figure 2:

This organic electroluminescence device comprise stack gradually substrate, anode layer, hole injection layer 302, hole transmission layer 303, electronic barrier layer 304, luminescent layer 305, hole blocking layer 306, electron transfer layer 307, buffer layer 308 and cathode layer 309.Wherein:

Substrate adopts glass (Glass), and the material of anode layer is that ITO, ITO are prepared in glass surface, is called for short ito glass together with glass.Certainly, the material of anode layer also can be FTO, AZO, IZO.Be preferably the ITO(tin indium oxide that square resistance is 10-20 Ω), thickness is 200nm;

The material of hole injection layer 302 is m-MTDATA(4,4', 4''-tri-(N-3-methylphenyl-N-phenyl is amino) triphenylamine), thickness 40nm;

The material of hole transmission layer 303 is two (1-naphthyl)-N, the N'-diphenylbenzidine of NPB(N, N'-), thickness 20nm;

The material of electronic barrier layer 304 is two (9-carbazyl) benzene of mCP(1,3-), thickness 10nm;

The material of luminescent layer 305 is two (2-(4', 5', 6'-trifluorophenyl) pyrimidine-N, the C that prepare doped with 7wt% embodiment 1 ²') (2-pyridinecarboxylic) close the mCP of iridium, thickness 30nm;

The material of hole blocking layer 306 is BCP(2,9-dimethyl-4,7-phenylbenzene-phenanthrolene), thickness 10nm;

The material of electron transfer layer 307 is Alq ₃(three (oxine) aluminium), thickness is 35nm;

The material of buffer layer 308 is LiF, thickness 1nm;

The material of cathode layer 309 is Al layer, thickness 120nm.

The structure of this organic electroluminescence device is: ITO (100nm)/m-MTDATA (40nm)/NPB (20nm)/mCP (10nm)/mCP:7wt%Ir title complex (30nm)/BCP (10nm)/Alq ₃(35nm)/LiF (1nm)/Al (120nm); Wherein, brace "/" represents laminate structure, and the colon ": " in P1:FIrpic represents doping.

The preparation technology of this organic electroluminescence device is as follows:

Glass-based plate deposits a layer thickness is 200nm, square resistance is 10 ~ 20 Ω tin indium oxide (ITO) as transparent anode 301;

On anode 301, the m-MTDATA(4 that a layer thickness is 40nm is prepared successively by vacuum evaporation, 4', 4''-tri-(N-3-methylphenyl-N-phenyl is amino) triphenylamine) hole-injecting material is as hole injection layer 302, a layer thickness is the NPB(N of 20nm, two (1-the naphthyl)-N of N'-, N'-diphenylbenzidine) hole mobile material is as hole transmission layer 303, a layer thickness is the mCP(1 of 10nm, two (9-carbazyl) benzene of 3-) electron-blocking materials is as electronic barrier layer 304, with the two (2-(4' prepared doped with 7wt% embodiment 1 that a layer thickness is 30nm, 5', 6'-trifluorophenyl) pyrimidine-N, C ²') (2-pyridinecarboxylic) close the mCP of iridium as luminescent layer 305,

On this luminescent layer 305, vacuum evaporation a layer thickness is successively the BCP(2 of 10nm again, 9-dimethyl-4,7-phenylbenzene-phenanthrolene) material be the Alq3 (three (oxine) aluminium) of 35nm as hole blocking layer 306, thickness is that the LiF of 1nm is as electron injection buffer layer 308 as electron transfer layer 307, thickness, the last vacuum plating of employing on the buffer layer techniques of deposition thickness is the metal A l of 120nm, as the negative electrode 309 of device.

After tested, the maximum work efficiency of this organic electroluminescence device is 25.3lm/W, and maximum current efficiency is 33.5cd/A, and the more existing organic electroluminescence device of this organic electroluminescence device has higher luminous efficiency.

Foregoing; be only preferred embodiment of the present invention; not for limiting embodiment of the present invention; those of ordinary skill in the art are according to central scope of the present invention and spirit; can carry out corresponding flexible or amendment very easily, therefore protection scope of the present invention should be as the criterion with the protection domain required by claims.

Claims (10)

1. the organic electromechanical phosphorescent material of following general formula (P):

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl.

2. a preparation method for organic electromechanical phosphorescent material, the method comprises the following steps:

A) following compd A and B is provided:

Compd A is compd B is

B) under atmosphere of inert gases, described compd A and described compd B are added in organic solvent according to the mol ratio of 1:2 ~ 4, at 62 ~ 135 DEG C, carry out ligand exchange reaction 5 ~ 10 hours, separating-purifying, obtain the organic electromechanical phosphorescent material of following general formula (P):

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl.

3. preparation method according to claim 2, is characterized in that, in described step (b), described organic solvent is the one in cellosolvo, 1,2-ethylene dichloride or 2-methyl cellosolve; The concentration range of described compd A in described organic solvent is 0.01 ~ 0.02mol/L.

4. preparation method according to claim 2, it is characterized in that, in described step (b), described separating-purifying step is as follows: after the reaction solution that described ligand exchange reaction obtains is chilled to room temperature naturally, add proper amount of methanol after removing partial solvent under reduced pressure to refilter, gained solid uses normal hexane, ether in ultrasonic lower washing successively, is that elutriant carries out silica gel column chromatography separation with methylene dichloride, steams and desolventizes rear drying.

5. preparation method according to claim 4, is characterized in that, described compd A adopts following steps to obtain:

C) following Compound C and D is provided:

Compound C is compound D is three hydrated iridium trichloride,

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl;

D) under atmosphere of inert gases, described Compound C and described Compound D are added in the aqueous solution of cellosolvo according to the mol ratio of 2 ~ 4:1, the concentration range of wherein said Compound C in described cellosolvo is 0.1 ~ 0.2mol/L, be heated to stirring reaction 24h under reflux state, after being chilled to room temperature, rotation is steamed except partial solvent, after adding distilled water filtration, then obtains described compd A with after distilled water, methanol wash drying successively.

6. preparation method according to claim 5, is characterized in that, described Compound C adopts following steps to obtain:

E) following compd E and F is provided:

Compd E is compound F 17-hydroxy-corticosterone is 2,3,4-trifluoro-benzene boric acid,

Wherein, R is H or C ₁~ C ₂₀straight or branched alkyl;

F) under atmosphere of inert gases, described compd E and described compound F 17-hydroxy-corticosterone are added toluene containing palladium catalyst or N according to the mol ratio of 1:1 ~ 1.5, in the solution of dinethylformamide, then drip alkaline catalysts to reheat, Suzuki linked reaction 6 ~ 12h at 85 ~ 100 DEG C of temperature, after being chilled to room temperature, separating-purifying, obtains described Compound C.

7. preparation method according to claim 6, it is characterized in that, at described step f) in, described separating-purifying step is as follows: the reaction solution that described Suzuki linked reaction obtains is poured in methylene dichloride carry out extracting, separatory, and be washed to neutrality, then filter with after anhydrous magnesium sulfate drying, filtrate decompression steams solvent and obtains crude product, be separated for elutriant carries out silica gel column chromatography with normal hexane with ethyl acetate again, after drying, obtain described Compound C.

8. preparation method according to claim 6, is characterized in that, at described step f) in, described palladium catalyst is that four (triphenyl phosphorus) close palladium or two chlorine two (triphenyl phosphorus) closes palladium; Described alkaline catalysts is salt of wormwood or sodium carbonate.

9. preparation method according to claim 6, is characterized in that, the mol ratio of described palladium catalyst and described compd E is 0.02 ~ 0.05:1; The mol ratio of described alkaline catalysts and described compd E is 1 ~ 3:1; In the solution of described toluene or DMF, the volume ratio of solute and water is 2:1; The concentration of described compd E in described organic solvent is 0.1 ~ 0.2mol/L.

10. an organic electroluminescence device, comprises anode, functional layer, luminescent layer and negative electrode, it is characterized in that, the material of described luminescent layer is organic electromechanical phosphorescent material according to claim 1.